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DC Permanent Magnet

Permanent magnet DC machine

 

Description

Connections

Parameters

Modelica Standard Library

Description

The DC PermanentMagnet (or DC Permanent Magnet) component models a DC Machine with permanent magnets. Armature resistance and inductance are modeled directly after the armature pins, using an Air Gap DC model. Permanent magnet excitation is modeled by a constant equivalent excitation current feeding the air gap.

The following losses are modeled:

• 

heat losses in the temperature dependent armature winding resistance

• 

brush losses in the armature circuit

• 

friction losses

• 

core losses (only eddy current losses, no hysteresis losses)

• 

stray load losses

No saturation is modeled.

Connections

Name

Description

Modelica ID

flange

Shaft

flange

support

Support at which the reaction torque is acting

support

pinap

Positive armature pin

pin_ap

pinan

Negative armature pin

pin_an

thermalPort

Optional thermal port

thermalPort

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

Jr

0.15

kgm2

Rotor moment of inertia

Jr

Js

Jr

kgm2

Stator moment of inertia

Js

Ta,oper

293.15

K

Operational armature temperature

TaOperational

Use Support Flange

false

 

True (checked) means enable stator support

useSupport

Use Thermal Port

false

 

True (checked) means thermal port is enabled

useThermalPort

Brush Losses

Name

Default

Units

Description

Modelica ID

V

0

V

Total voltage drop of brushes, if ibrush>Ilinear

V

Ilinear

0.01Ianom

A

Current indicating linear voltage region of brush voltage drop

ILinear

See Brush for details of the brush loss model.

Core Losses

Name

Default

Units

Description

Modelica ID

Pref

0

W

Reference rotor core losses

PRef

Vref

Vnom

V

Reference RMS voltage

VRef

ωref

ωnom

rads

Reference angular velocity

wRef

See Core for details of the core loss model.

Friction Losses

Name

Default

Units

Description

Modelica ID

Pref

0

W

Reference friction losses

PRef

ωref

ωnom

rads

Reference angular velocity

wRef

pω

2

V

Exponent of friction

power_w

See Friction for details of the friction loss model.

Stray Load Losses

Name

Default

Units

Description

Modelica ID

Iref

Ianom

W

Reference RMS current

IRef

Pref

0

W

Reference friction losses

PRef

ωref

ωnom

rads

Reference angular velocity

wRef

pω

1

V

Exponent of stray load loss

power_w

See Stray Load for details of the stray load loss model.

Nominal Parameters Parameters

Name

Default

Units

Description

Modelica ID

Ia,nom

100

A

Nominal armature current

IaNominal

ωnom

47.5π

rads

Nominal rotational speed

wNominal

Ta,nom

293.15

K

Nominal armature temperature

TaNominal

Va,nom

293.15

V

Nominal armature voltage

VaNominal

Nominal Resistances And Inductances Parameters

Name

Default

Units

Description

Modelica ID

αa

0

1K

Temperature coefficient of armature resistance

alpha20a

La

0.0015

H

Armature inductance

La

Ra

0.05

Ω

Warm armature resistance

Ra

Ta,ref

293.15

K

Reference temperature of armature resistance

TaRef

Modelica Standard Library

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

See Also

DC Machines

Electrical Library

Electrical Machines